<?php
/**
 * Copyright (c) 2012 by PHP Team of NIX Solutions Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * Core_Version
 *
 * get current tag
 * tip - latest changeset
 * for correct working update live servers only to tags
 *
  * @category Core
  * @package  Core_Version
 */
class Core_Version
{
    /**
     * @var string
     */
    static protected $_version = null;

    /**
     * get version
     *
     * @static
     * @return string
     */
    static public function getVersion()
    {
        if (null === self::$_version) {
            self::$_version = trim(`hg parent | grep tag: | awk '{print($2)}'`);
        }
        return self::$_version;
    }
}
